import type { ParsedRRule, RecurrenceFrequency } from "../types";
/**
 * Ensures BYDAY is only used with weekly recurrence.
 */
export declare function sanitizeByDay(freq: RecurrenceFrequency, byDay: number[] | undefined): number[] | undefined;
/**
 * Ensures recurrence limits are internally consistent.
 */
export declare function sanitizeParsedRRule(parsed: ParsedRRule): ParsedRRule;